I've found (in the research that I've done) that e-cigs have no negatives as far as health goes. Especially when you can control the amount of nicotine that you use in your e-cig, all the way down to none if you choose. At that point you would either be 'vaping' pharmaceutical grade Propylene Glycol (very thin almost watery) or 100% vegetable glycerin (thick and produces a massive amount of vapor.
I have tried many different brands. There is one that I like better and it's for the exact reason mentioned up above. A onine company called www.totallywicked-eliquid.com
You get refillable cartridges and their 'e-juice' (which is the straight nicotine (remember straight nicotine is classified as a poison) mixed with a Propolye Glycol or Vegetable Glycerine.
You can also buy the two separately so you can mix the amount of nicotine you get. From the high strength 36mg, down to the low 10mg and finally no nicotine, straight dilutent! This way you personally know how much nicotine you're ingesting and can control it and wean yourself down to nothing if your objective is to quit.
I also posted earlier of a promotion redemtion code: CHRYSLER that I found. That page has since been taken down!?!?! After seeing that, I did go back to their web site and add some items to 'my basket' as if I were checking out and the 'code' still seemed to work. . . I wonder if they didn't want that publicly known?
At any rate; those are my 2 cents. I hope it helps. It has most certainly helped me. I rather enjoy the e-cig and since there is no tar, smell, stink, 4,000 carcinogens, smelly clothes/car/hair I feel much safer.
I'm posting my review in a lot of forums because I am so impressed with this e-cig thing and I think we all need to get healthier. And if any of you have children in school know that the school pushes the no smoking thing alot (great for them!) downside was my daughter brought home a contract that I had to sign to quit smoking. Well, I did quit smoking (as defined by websters) now I just 'Vape' and love it even more than traditional smoking!!!